Ordering Recommendation

Recommended test to detect activated protein C resistance and confirm presence of a factor V Leiden variant.


Electromagnetic Mechanical Clot Detection/Polymerase Chain Reaction/Fluorescence Monitoring




1-5 days

New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation

Light Blue (Sodium Citrate) AND Lavender (EDTA), Pink (K2EDTA), or Yellow (ACD Solution A or B). Refer to Specimen Handling at aruplab.com for hemostasis/thrombosis specimen handling guidelines.

Specimen Preparation

Transport 1.5 mL platelet-poor plasma AND 3 mL whole blood. (Min: 1 mL/each)

Storage/Transport Temperature

Plasma: CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered.
Whole Blood:

Unacceptable Conditions

Serum, clotted or hemolyzed specimens.


Plasma: Ambient: 4 hours; Refrigerated: Unacceptable; Frozen at -20°C: 3 months; Frozen at -70°C: 6 months
Whole Blood: Ambient: 72 hours; Refrigerated: 1 week; Frozen: Unacceptable

Reference Interval
Test Number
Reference Interval
0030127 APC Resistance Profile 2.0 or greater
0097720 Factor V Leiden (F5) R506Q Mutation Negative: This sample is negative for factor V Leiden, R506Q mutation.

Interpretive Data

Ratios less than 2.00 suggest APC resistance. This method uses factor V deficient plasma; therefore, APC resistance due to a nonfactor V mutation will not be detected. Extreme factor V deficiency may cause abnormal ratio.

No compliance statements are in use for this test.


If APC resistance is normal, then no further testing will be added. If APC resistance is low, then Factor V Leiden by PCR will be added. Additional charges apply.

Hotline History
CPT Codes

85307; if reflexed, add 81241

Component Test Code* Component Chart Name LOINC
0030193 APC Resistance 13590-5
0030194 Factor V Leiden by PCR 21668-9
2001308 FACV REF Specimen 31208-2
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
  • Activated Protein C Resistance
  • APCR
  • Factor V Leiden Functional Assay with Reflex to PCR
  • Protein C Resistance
APC Resistance Profile with Reflex to Factor V Leiden